<div class="gt-directive-img-slider" ng-show="imgFilesLength != -1">

    <span class="current-img-wrapper">
         <img ngf-src="imgFiles[currentIndex]" alt="图片展示" />
    </span>


    <span ng-click="prev()" class="left-btn ctrl-btn"><i class="fa fa-chevron-left"></i></span>
    <span ng-click="next()" class="right-btn ctrl-btn"><i class="fa fa-chevron-right"></i></span>

</div>